Typewriting-machine



A. G. F. KUROWSKI. TYPEWRITING MACHINE. APPLICATION men JUNE 18. 19:9.

Patented Feb. 8, 1921.

ALFRED G. F. KUROVFSKI, OF BELOOKLYET,

TYPEVIRITEB COM'PAIIY, OF NEW NEW YORK, ASSIGNOR TO UNDERWQOD .93. ii, A CORPORATION OF DELAVIARE.

TYPE'WRITING-MACHINE.

Application filed June 18, 1919.

F. Kunowit kn wn that I, ALFRED G. sin. a subject of the Emperor of Germany, or a citizen of Germany, but having taken out preliminary United Statesnaturalization papers, residing in Brooklyn borough, in the county of Kings, city and State of Xew York, have invented certain new and useful Improvements in Typewriting-lvlachines, of which the following is a specification.

T his invention relates to typewriting machines, and particularly to the paper-feed devices thereof, an object of the invention being to secure a more accurate paper-feed and one which is at the same time easy of adjustment and light in weight.

A feature of the invention relates to the construction and arrangement of parts wherebypre'ssure on the forward and rear feed-rolls may be differently proportioned to suit the particular kind of work which is being performed on the typewriter. In ordinary work. such as with thin sheets of paper, it is desirable to have the rear pressure rolls exert greater force against the platen than the forward pressure rolls. in other classes of work, such, for instance, as cards and envelops. it is desirable to have more pressure on the forward feed rolls. In my improved construction, this is accomplished by providing" springs which exert pressure against the roll-supporting arms or hangers, these being mounted on a floating pivot, and the springs exert their pressure between the floating pivots of the hangers and their rear roll-supporting ends. whereby greater presare i normally exerted on the rear pressure rolls. Provision is made, however, for varying the point of application of spring-pressure, so that more pressure maybe exerted pen the forward rolls when desired. Provision is also made whereby the tension of the springs may be adjusted to simultaneously vary the pressure exerted on both rolls.

Other features and advantages will hereinafter appear.

in the accompanying drawings,

Figure 1 is a view. partly in section and partly in elevation. the parts so positioned that greater pressure is exerted against the rear pressure rolls.

Fig. 2 is a View similar to Fig. 1, but

specification of Letters Patent.

Patented Feb. 8, 1921.

Serial No. 305,114.

showing the parts in a different position of adjustment, whereby the point of application of the spring pressure has been changed from that shown in Fig.1 to exert'more pressure on the forward rolls.

Fig. is a perspective View of the invention, with parts broken away centrally to more clearly show the mechanism which would otherwise be hidden by the platen.

. Fig. 4t 1s a perspective detail of the righthand portion of the platen support.

Fig. 5 is a detail of a portion of the platen frame tie-bar.

Fig. 6 is a perspective detail of one of the spring holders. I I

F 7 is a perspective detail of one of the shaft supporting brackets carried by the platen frame tie-bar.

8 is a View similar to Fig. l, but showing the pressure rolls released from, the platen, and also showing the tension adjusting screws in a different position from the position they occupy in Fig. 1.

T his invention is in the nature of an improvement on my application No. 295,858, filed May 9, 1919, and many of the parts of this invention may be constructed as shown and described in said application. Certain other parts, however, are constructed entirely differently from what 'is shown in said application as will be particularly pointed out.

Referring to the drawings, 1 indicates the side members of the platen frame, in which the platen 2 is journaled. Connecting the side members 1 is'a tiemember 3, this member being channel-shaped as indicated, and suitably fastened to the side members 1. l asrencd to the bottom of this tie-member, and lying' inside of it, are preferably two brackets 4 substantially U-shape. These brackets have alined holes 5 in their sides tl'irone h which loosely passes a shaft 6 havinn, its ends journaled in the side: frame members 1, said shaft constituting a pressure roll release shaft. The brackets l are slotted as shown in Fig. 7, and mounted for up-and-down movement in the slots is a pressure roll carrying shaft 7, and pivotally supported. on said shaft and preferably near each end thereof, is a hanger 8, these hangcrs having slotted ends for supporting forward pressure roll shaft 9 and rear pressure roll shaft 10. The shaft 7 is moved up and down in the slots of the brackets i by forked arms 11 suitably connected to the release shaft 6.

In order to hold the pressure rolls against the platen'with a yielding pressure, resilient means in the form of springs are provided, and the particular construction and mounting of these springs and their means of adjustment form an important feature of the present invention. To support the springs and provide for their proper adjustment, flat-bottomed spring holders 12 are provided, these being shaped as shown in Fig, 6, said holders having an upwardly and rearwardly projecting portion 13 provided with spring holding studs 14 on its upper surface. The forward portion of each holder is bent up as shown and is screw-threaded at 15. A spring 16 engages over the stud of each holder and at its upper end engages a slotted clamp 17, which clamp embraces the rear portion of the hanger 8 in its slot.

By reason of the fact that the hangers 8 are pivotally mounted on the shaft 7, and by reason of the fact that the shaft 7 is mounted for up-and-down movement in brackets 4, said shaft 7 forms a floating pivot for the hangers 8, and the springs 16 bearing against the hangers S'act to press the hangers and consequently the rear and forward rolls carried thereby into yielding contact with the platen surface. Since, however, the bearing point of each spring is between the shaft 7, on which the hangers 8 pivot, and the rear rolls, it is evident that greater pressure will be exerted against these rolls than against the forward rolls. The parts are so proportioned and the bearing points of the springs against the hangers 8 are such that normally the pressure exerted on the rear and forward rolls is such that the machine is adjusted for feeding ordinary sheets of paper. For other work, such as postal cards or envelope, it is advantageous to exert slightly more pressure on the forward rolls, and, to enable this to be readily accomplished, the clamps 17 may be slid forwardly along the arms of the hangers 8 and clamped in desired position by clamping screws 18.

Furthermore, to enable the springs to exert their pressure to the best advantage, the

spring holders are also made adjustable, so that they may be moved forwardly and backwardly in a horizontal plane. To ac complish this, screws 19 engage inverted key hole slots 20 in the forward portion of the tie-member 3, said screws engaging in th screw-threaded portions 15 in the spring holders 12. By turning the screws one way or the other, the holders are moved forwardly or backwardly to correspond to the position of the clamps 17 on the hangers 8.

In order to adjust the tension of the springs 16, screws 21 are provided, one for each spring holder, which screws take into of pressure rolls therefor. m

screw-threaded openings in the bottom portion of the tie-member 3 and in the brackets 4 and bear against the under side of the spring holders 12. When the springs 16 are under the least tension, the horizontal portions of the spring holders 12 rest against an upstanding edge 23 of the channel of the tie-member 3, as indicated in Fig. 8. When it is desired to increase the tension of the springs 16, the screws 21 may be screwed up to the position shown in Fig. 1, and, during this adjustment, movement of the spring holders from the Fig. 8 position to the Fig. 1 position is permitted by reason of the fact that the screws 19 slide in the key hole slots 20. To readily enable this sliding movement the screws 19 have each a reduced portion, which engages in the slot 20, the screws, when the parts are assembled, being inserted in the lower enlar ed end of the key hole slot and then moved upwardly into the narrow portion thereof.

The pressure rolls may be thrown off by any suitable means, and, as shown, the shaft 9 has at one end thereof a crank arm 2%, to which is pivoted link 25, the upper end of which is pivotally connected to an arm 26 of a release lever 27, movement of which lever rocks the'shaft 6 and lowers the arms 11, these arms engaging pins 28, forming part of the hangers 8, thus drawing down the hangers and rotating about the shaft 7 to draw down the rear ends thereof which carry the roll shaft 10. v

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without cthers.

Having thus described my invention, I claim: 7

1. In a typewriting machine, the combination with a platen, of forward and rear sets 7 I ns resiliently holding both sets of rolls against the platen, means for varying the tension of said resilient means, and means for varying the point of application thereof, whereby pre sure may be increased or decreased on. both sets of rolls, and whereby the pressure may be differently proportioned between the two sets of rolls to suit dificrcnt classes of work to be performed on the typewriter.

2. In a typewriting machine, the combination with a platen, of front and rear sets of pressure rolls therefor, and resilient means common to both sets of said pressure rolls to hold them against said platen, said means being so constructed and arranged that pressure on one set of rolls may be varied with reference to that exerted on the other set.

3. In a typewriting machine, the combination with a platen, of rear and front pres sure rolls therefor, and resilient means for holding said rolls against the platen, said means so constructed and arranged that tension on both rolls may be adjusted at will and that the point of application of said tension may be varied.

l In a typewriting machine,the combination with a platen, of forward and rear pressure roll shafts, pivotally mounted hangers supporting said shafts, and resilient means, independent of the pivotal mounting, for holding said rolls against the platen,said means adjustable to bear against each hanger between its pivot and the shaft of one set of rolls, whereby the resilient means adjustably acts to hold one set of rolls with greater pressure than the other set.

5. In a typewriting machine, the combination with a platen, of forward and rear pressure roll shafts, pivotally mounted hangers supporting said shafts, resilient means for holding said rolls against the platen, said means bearing against each hanger between its pivot and the shaft of one set Oi olls, whereby the resilient means acts to hold one set of rolls with greater pressure than the other set, and means for adjusting the point of pressure of said resilient means along said hangers.

6. In a typewriting machine, the combination with a platen, of pressure rolls therefor, hangers carrying said rolls, floating pivots carrying said hangers, pressure springs, one bearing against each hanger, and means whereby the bearing points of said springs may be varied.

7. In a typewriting machine,the combination with a platen, of forward and rear pressure rolls therefor, resilient means common to both rolls and acting on said rolls to hold them in contact with the platen, and means for shifting said resilient means between the forward and rear pressure rolls to vary the relative pressure of the rolls.

8. In a typewriting machine,the combination with a platen, of pressure rolls therefor, pivotally mounted hangers carrying said rolls, pressurespring-carrying brackets mounted adjacent said hangers, springs mounted to bear against said brackets and said hangers. clamps engaging said hangers ag inst which the top of each spring bears, said clamps adjustable along said hangers to vary the point of application of spring pressure, and means for moving said brackets to correspond with the adjustment of the clamp on its corresponding hanger.

9. In a typewriting machine,thecomb1nation with platen, of pressure rolls thereiv mounted hangers carrying A essureing-carrying brackets mounted adjacent said hangers, springs mounted to bear against said brackets and said hangers, clamps engaging said hangers against the top of which each spring bears, said clamps adjustable along said hangers to I the point of application of spring pressure, means for moving said brackets to correspond with the adjustment of the clamp on its corresponding hanger, and

to move said brackets in the line of action of said spring pressure to thereby adjust the tension of saio springs.

10. In a typewriting machine, the combination with a platen, of forward and rearward sets of pressure rolls therefor, means resiliently holding both sets of rolls against the platen, and means for varying the point of application of said resilient means whereby the pressure may be differently propor tioned between the two sets of rolls to suit different classes of wor to be performed on the typewriter.

11. In a typewritin machine, the combination with platen, pressure rolls therefor, pivotally mounted hangers carrying said rolls, pressurespring-carrying brackets mounted adjacent said hangers, springs mounted to bear against said brackets and said hangers, and clamps engaging said hangers against which the top of each spring bears, said clamps adjustable along said hangers to vary the point of application of spring pressure.

12. In a typewriting machine, the combination with platen, of pressure rolls therefor, pivotally mounted hangers ca rying said rolls, pressurespring-carrying brackets mounted adjacent said hangers, springs mounted to bear against said brackets and said hangers, clamps engaging said hangers against the top of which each spring bears, said clamps adjustable along said hangers, to vary the point of application of spring pressure, and an adjusting screw threaded into each bracket to move the same to correspond with adjustment of the clamp on its corresponding hanger.

13. In a typewriting machine, the combination with a platen, a frame supporting the same and including side members and a connecting tie-member, of pressure rolls for said platen, pivotally mounted hangers carrying said rolls, pressurespring-carrying brackets mounted adjacent said hangers, springs mounted to bear against said brackets and said hangers, clamps engaging said hangers a 'ainst the top of which each spring bears, said clamps adjustable along said hangers to vary the point of application of spring pressure, an adjusting screw threaded into each bracket to move the same to correspond with adjustment of the clamp on its corresponding hanger, and an adjusting screw threaded into said tie-member and engaging the bottom of said bracket to move the same up or down in the line of action of spring pressure to thereby adjust the tension of said springs.

14. In a typewriting machine, the combination with a platen, a frame supporting the same and including side members and a connecting tie-member, of pressure rolls for said platen, pivotally mounted hangers car rying said rolls, pressurespring-carrying brackets mounted adjacent said hangers, springs mounted to bear against said brad"- ets and said hangers, clamps engaging said hangers against the top of which each spring bears, each clamp being adjustable along said hanger to vary the point of 0pplication of spring pressure, adjusting screws threaded into each bracket and passing through key-hole slots in said tie-member for moving said bracket to correspond with the adjustment oi the clamp on its corresponding hanger, and adjusting screws threaded into the bottom of said tie-member and engaging said brackets to more each of them up and down in the line of action oi spring pressure to thereby adjust the ten sion of said springs, the key-hole slots in said tie-member permitting the movement of said first mentioned adjusting screws during the up and down movement of said brackets.

15,. In a typewriting machine, the combination with a platen and a frame supporting'the same including side members and a. connecting tie-member, of front and rear pressure rolls for the platen, pivotally mounted hangers common to both sets of rolls to carry them, an endwise thrusting coil spring for each hanger and bearing upon it between the front and rear rolls, and means for adjustably supporting said springs upon the tie-member to vary the relative thrust of the springs upon the rear and front rolls.

ALFRED G. F. KUROVVSKI.

iVitnesses ELLA A. J oLIDoN, EDITH B. LIBBEY. 

